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predictor-based neural dynamic surface control for distributed formation tracking of multiple marine surface vehicles with improved transient performance

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Science China(Information Sciences) 2016年第9期59卷 208-226页

作者： Zhouhua PENG Dan WANG Tieshan LI School of Marine Engineering Dalian Maritime University Control Science and Engineering Dalian University of Technology School of Navigation Dalian Maritime University

In this paper, we investigate the distributed formation tracking problem of multiple marine surface vehicles with model uncertainty and time-varying ocean disturbances induced by wind, waves, and ocean currents. The objective is to achieve a collective tracking with a time-varying trajectory, which can only be accessed by a fraction of follower vehicles. A novel predictor-based neural dynamic surface control design approach is proposed to develop the distributed adaptive formation controllers. We use prediction errors, rather than tracking errors, to construct the neural adaptive laws, which enable the fast identification of the vehicle dynamics without incurring high-frequency oscillations in control signals. We establish the stability properties of the closed-loop network via Lyapunov analysis, and quantify the transient performance by deriving the truncated L2 norms of the derivatives of neural weights, which we demonstrate to be smaller than the classical neural dynamic surface control design approach. We also extend the above result to the distributed formation tracking using the relative position information of vehicles, and the advantage is that the velocity information of neighbors and leader are required. Finally, we give the comparative studies to illustrate the performance improvement of the proposed method.

关键词： dynamic surface control distributed formation tracking predictor marine surface vehicles neural networks

predictor-based error correction method in short-term climate prediction

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Progress in Natural Science:Materials International 2008年第1期18卷 129-135页

作者： Hongli Ren Laboratory for Climate Studies,National Climate Center,China Meteorological Administration,Beijing 100081,China Laboratory for Climate Studies National Climate Center China Meteorological Administration

In terms of the basic idea of combining dynamical and statistical methods in short-term climate prediction,a new prediction method of predictor-based error correction(PREC)is put forward in order to effectively use statistical experiences in dynamical ***- yses show that the PREC can reasonably utilize the significant correlations between predictors and model prediction errors and correct prediction errors by establishing statistical prediction ***,the PREC is further applied to the cross-validation experiments of dynamical seasonal prediction on the operational atmosphere-ocean coupled general circulation model of China Meteorological Admin- istration/National Climate Center by selecting the sea surface temperature index in Ninflo3 region as the physical predictor that represents the prevailing ENSO-cycle mode of interannual variability in climate *** is shown from the prediction results of summer mean circulation and total precipitation that the PREC can improve predictive skills to some *** the PREC provides a new approach for improving short-term climate prediction.

关键词： Short-term climate prediction Seasonal prediction predictor Error correction

predictor-corrector interior-point algorithm for linearly constrained convex programming

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Journal of Central South University 2001年第3期13卷 208-212页

作者： LIANG Xi-ming (College of Information Science & Engineering, Central South University, Changsh a 410083, China) 1. College of Information Science & Engineering Central South University 410083 Changsha China

Active set method and gradient projection method are curre nt ly the main approaches for linearly constrained convex programming. Interior-po int method is one of the most effective choices for linear programming. In the p aper a predictor-corrector interior-point algorithm for linearly constrained c onvex programming under the predictor-corrector motivation was proposed. In eac h iteration, the algorithm first performs a predictor-step to reduce the dualit y gap and then a corrector-step to keep the points close to the central traject ory. Computations in the algorithm only require that the initial iterate be nonn egative while feasibility or strict feasibility is not required. It is proved th at the algorithm is equivalent to a level-1 perturbed composite Newton method. Numerical experiments on twenty-six standard test problems are made. The result s show that the proposed algorithm is stable and robust.

关键词： linearly constrained convex programming predictor corrector interior point algorithm numerical experiment

Analysis of predictor equations for determining the blast-induced vibration in rock blasting

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International Journal of Mining Science and Technology 2019年第6期29卷 905-915页

作者： Marilena Cardu Dario Coragliotto Pierpaolo Oreste DIATI Politecnico di Torino 10129 TorinoItaly IGG-CNR Torino 10129Italy Lochaline Quartz Sand Ltd. Lochaline MinePA805LQ MorvernScotlandUnited Kingdom

The paper proposes a new empirical correlation designed to complement the‘‘site laws"currently used to evaluate the attenuation in the rock masses of vibrations induced by rock *** formula contains a deformed exponential known as the K-exponential,which seems to well represent a large number of both natural and artificial phenomena ranging from astrophysics to quantum mechanics,with some extension in the field of economics and *** validation of the formula was performed via the analysis of vibration data covering a number of case studies,which differed in terms of both operation and rock type.A total of 12 experimental cases were analysed and the proposed formulation exhibited a good performance in 11 of *** particular,the proposed law,which was built using blast test data,produced very good approximations of the points representing the vibration measurements and would thus be useful in organising production ***,the developed formula was found to work less well when a correlation obtained for a given site was applied to another presenting similar types of rocks and operations,and thus should not be employed in the absence of measurements from test data.

关键词： Rock blasting Vibrations predictor equation Site law K-statistics K-exponential

EXPLICIT-Kinase:A gene expression predictor for dissecting the functions of the Arabidopsis kinome

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Journal of Integrative Plant Biology 2022年第7期64卷 1374-1393页

作者： Yuming Peng Wanzhu Zuo Hui Zhou Fenfen Miao Yu Zhang Yue Qin Yi Liu Yu Long Shisong Ma MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics School of Life SciencesUniversity of Science and Technology of ChinaInnovation Academy for Seed DesignChinese Academy of SciencesHefei 230027China State Key Laboratory of Crop Stress Adaptation and Improvement School of Life SciencesHenan UniversityKaifeng 475001China State Key Laboratory for Plant Molecular Genetics Center of Excellence for Molecular Plant SciencesChinese Academy ofSciencesShanghai 200032China School of Data Science University of Science and Technology of ChinaHefei 230027China

Protein kinases regulate virtually all cellular processes,but it remains challenging to determine the functions of all protein kinases,collectively called the“kinome”,in any *** developed a computational approach called EXPLICIT-Kinase to predict the functions of the Arabidopsis *** the activities of many kinases can be regulated transcriptionally,their gene expression patterns provide clues to their functions.A universal gene expression predictor for Arabidopsis was constructed to predict the expression of 30,172 nonkinase genes based on the expression of 994 *** model reconstituted highly accurate transcriptomes for diverse Arabidopsis *** identified the significant kinases as predictor kinases for predicting the expression of Arabidopsis genes and ***,these predictor kinases were often regulators of related pathways,as exemplified by those involved in cytokinesis,tissue development,and stress *** analyses revealed that portions of these predictor kinases are shared and conserved between Arabidopsis and *** an example,we identified a conserved predictor kinase,RAF6,from a stomatal movement *** verified that RAF6 regulates stomatal *** can directly interact with SLAC1,a key anion channel for stomatal closure,and modulate its channel *** approach enables a systematic dissection of the functions of the Arabidopsis kinome.

关键词： kinase kinome predictor

A predictor MODIFICATION TO THE EBDF METHOD FOR STIFF SYSTEMS

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Journal of Computational Mathematics 2011年第2期29卷 199-214页

作者： Elisabete Alberdi Juan Jose Anza Lea Artibai Ikastetxea Xemein Avenue 19 48270 Markina-Xemein (Vizcaya) Spain Department of Applied Mathematics ETS de Ingenieria de Bilbao Universidad del Pais Vasco Alameda de Urquijo s/n 48013 Bilbao Spain

In this paper we modify the EBDF method using the NDFs as predictors instead of BDFs. This modification, that we call ENDF, implies the local truncation error being smaller than in the EBDF method without losing too much stability. We will also introduce two more changes, called ENBDF and EBNDF methods. In the first one, the NDF method is used as the first predictor and the BDF as the second predictor. In the EBNDF, the BDF is the first predictor and the NDF is the second one. In both modifications the local truncation error is smaller than in the EBDF. Moreover, the EBNDF method has a larger stability region than the EBDF.

关键词： Backward differentiation formula (BDF) EBDF predictor Stability Stiff Systems.

Intraoperative acidosis is a new predictor for postoperative pancreatic fistula after pancreaticoduodenectomy

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Hepatobiliary & Pancreatic Diseases International 2016年第3期15卷 302-309页

作者： Erdem Kinaci Mert Mahsuni Sevinc Abdulkerim Ozakay Savas Bayrak Ekrem Cakar Serkan Sari Istanbul Training and Research Hospital Department of General Surgery

BACKGROUND： Early diagnosis of postoperative pancreatic fistula （POPF） is important for proper interventions. The pre- operative, intraoperative and early postoperative biochemical markers have predictive value of ... 详细信息

关键词： acidosis fistula intraoperative predictor pancreaticoduodenectomy

Design of Smith predictor Based Fractional Controller for Higher Order Time Delay Process

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Computer Modeling in Engineering & Sciences 2019年第6期119卷 481-498页

作者： P.R.Hemavathy Y.Mohamed Shuaib S.K.Lakshmanaprabu Department of Electronics&Instrumentation Engineering B.S.Abdur Rahman Crescent Institute of Science&TechnologyChennaiIndia Department of Electrical&Electronics Engineering B.S.Abdur Rahman Crescent Institute of Science&TechnologyChennaiIndia

Normally all real world process in a process industry will have time *** those processes with time delays,obtaining satisfactory closed loop performances becomes very *** this work,three interacting cylindrical tank process is considered for study and the objective of the work is to compensate for time delays using smith predictor structure and to maintain the level in the third ***/Output data is generated for the three interacting tank *** is approximated as Integer First Order Plus Dead Time system(IFOPDT)and Fractional First Order Plus Dead Time system(FFOPDT).Smith predictor based fractional order Proportional Integral controller and Integer order Proportional Integral controller is designed for the IFOPDT and FFOPDT model using frequency response technique and their closed loop performance indices are compared and *** servo and regulatory responses are simulated using Matlab/Simulink.

关键词： Fractional order proportional integral controller frequency response technique smith predictor three interacting tank process

Prostate-specific antigen half-life： a new predictor of progression- free survival and overall survival in Chinese prostate cancer patients

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Asian Journal of Andrology 2009年第4期11卷 443-450页

作者： Guo-Wen Lin Xu-Dong Yao Shi-Lin Zhang Bo Dai Chun-Guang Ma Hai-Liang Zhang Yi-Jun Shen Yao Zhu Yi-Ping Zhu Guo-Hai Shi Xiao-Jian Qin Ding-Wei Ye Department of Urology Cancer Hospital Fudan University Shanghai 200032 China Department of Oncology Shanghai Medical College Fudan University Shanghai 200032 China

We investigated the potential value of prostate-specific antigen half-life （PSAHL） and decreasing velocity （PSAVd） to predict progression-free survival （PFS） and overall survival （OS） in Chinese patients with prostate cancer. A total of 153 patients treated with hormonal therapy were included in the study. Of these, 78 patients progressed to hormone- refractory prostate cancer （HRPC） and 24 patients died by the end of follow-up. PSAHL was defined as the time during which prostate-specific antigen （PSA） concentration became half of the initial value during the first hormonal therapy. PSAVd reflected the decreasing velocity of PSA during the first hormonal therapy. PFS was defined as the interval from the beginning of hormonal therapy to HRPC. Cox proportional hazards regression analysis was used to evaluate whether PSAHL and PSAVd were significantly associated with PFS and OS. The median PSAHL and PSAVd were 0.50 months and 33.8 ng mL^-1 per month. The median PFS and OS were 22.7 months （95% confidence interval [CI], 22.0-29.6 months） and 43.5 months （95% CI, 37.9-48.4 months）, respectively. On univariate and multivariate analysis, long PSAHL （〉 0.5 months）, metastatic disease, high biopsy Gleason scores （〉 8） and high nadir PSA （〉 0.4 ng mL^-1） were all found to be significantly associated with short PFS. Long PSAHL, high nadir PSA and short PSA doubling time （PSADT 〈 2.0 months） were significantly associated with short OS. There were no significant relationships between PSAVd and either PFS or OS. Thus, PSAHL is a promising new independent predictor of survival. Patients with long PSAHL were identified as those at high risk for a relatively short PFS and OS.

关键词： predictor prognosis prostate cancer prostate-specific antigen decreasing velocity prostate-specific antigen half-life